How do i change between excel worksheets in vbscript

Hi,

Im looking to change between different worksheets in excel using vbscript. At the moment im able to open up one worksheet and make changes to that one sheet - sheet_1, but when i try to set the worksheet to sheet_2 nothing seems to happen, it remains on sheet_1 Does anyone know if im missing some code?

Set objXL = CreateObject("EXCEL.APPLICATION")
Set objWB = objXL.Workbooks.Open ("Input_1.xls")
Set objWS = objWB.Worksheets("sheet_1")
	   objXL.Visible = True
...........
..........
Set objWS = objWB.Worksheets("sheet_2")

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